..We showed, for the first time, an association between opium use and gastric adenocarcinoma. Given that opium use is a traditional practice in many parts of the world, these results are of public health significance...

..Control selection is a major challenge in epidemiologic case-control studies. The aim of our study was to evaluate using hospital versus neighborhood control groups in studying risk factors of esophageal squamous cell carcinoma (ESCC)...

Prevalence of celiac disease among patients with Behcet's disease in Iran

..The findings of this study support a protective influence of female hormonal factors on the risk of ESCC. However, further epidemiological and mechanistic studies are required to prove a protective association...

..The observed association between nass chewing and poorer prognosis needs further investigations; this association may suggest a possible role for ingestion of nass constituents in prognosis of ESCC...

Association of tooth loss and oral hygiene with risk of gastric adenocarcinoma

..We describe a boy with chronic abdominal pain, nausea and vomiting, and weight loss. The imaging was compatible with Takayasu's arteritis. Chronic mesenteric ischemia was the etiology of the patient's symptoms...